<div class="js-spoilerbox bbcode-spoilerbox">
<a class="js-spoilerbox__link bbcode-spoilerbox__link" href="#">
<span class="bbcode-spoilerbox__link-icon"></span>hello
</a>
<div class="js-spoilerbox__body bbcode-spoilerbox__body">
<div class="js-spoilerbox bbcode-spoilerbox">
<a class="js-spoilerbox__link bbcode-spoilerbox__link" href="#">
<span class="bbcode-spoilerbox__link-icon"></span>another box
</a>
<div class="js-spoilerbox__body bbcode-spoilerbox__body">Content</div>
</div>
Another content
</div>
</div>
